Lpc2000

--- In lpc2000@yahoogroups.com, "tah2k" <tah2k@y...> wrote:
> 
> When enabled and timed out, the LPC2138 watchdog with generate an 
> interrupt and may cause a reset depending on the state of 
> WDMOD:WDRESET bit.
> 
> I can see the interrupt being useful during debugging when the reset 
> is disabled, but does it serve any purpose when the reset is 
> enabled? Would the ISR even get serviced if the watchdog times out 
> and a reset is forced?

I think the idea is that you can either reset the chip, or you can 
use the interrupt.  I don't know why you would use the interrupt 
instead of the reset, but I have seen PC based embedded systems that
use a normal timer interrupt as a watchdog when no watchdog hardware
was available.  It was more of a way to detect that one of the tasks
was not responding.